<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="isLoading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.art_id" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}-{{article.art_id}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{article.aut_name}}</div>
          <div slot="label" class="publish-date">{{article.pubdate | dateFormat}}</div>
          <doFollow v-model="article.is_followed" :aut_id="article.aut_id"></doFollow>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref="content" v-html="article.content">

        </div>
        <van-divider>正文结束</van-divider>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errorStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="getDetail">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->

      <!--文章回复-->
      <commentList :artId="this.artId" :commentList="commentList" @update_total_count="totalCount = $event"></commentList>
    </div>

    <!--回复弹出层-->
    <van-popup
      v-model="show"
      closeable
      position="bottom"
    >
    <comment-post :artId="this.artId" @updateComments="updatRows($event)"></comment-post>
    </van-popup>
    <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="show = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :info="totalCount"
        color="#777"
      />
      <van-icon
        color="#777"
        name="star-o"
      />
      <van-icon
        color="#777"
        name="good-job-o"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
  </div>
</template>

<script>
import { getArticle } from '@/api/article.js'
import doFollow from '@/components/do-follow/index.vue'
import commentList from './components/comment-list.vue'
import commentPost from './components/comment-post.vue'
import { ImagePreview } from 'vant'
export default {
  // 定义属性
  data() {
    return {
      article:{},
      imgList: [],
      isLoading:true,
      errorStatus:200,
      totalCount:0,
      show:false,
      commentList:[]
    }
  },
  props: {
    artId: {
      type: [String, Number],
      required: true
    }
  },
  components: {
    doFollow,
    commentList,
    commentPost
  },
  // 计算属性，会监听依赖属性值随之变化
  computed: {
  },
  // 监控data中的数据变化
  watch: {},
  // 方法集合
  methods: {
    async getDetail() {
      try {
        this.isLoading = true
        const { data } = await getArticle(this.artId)
        this.article = data.data 
        // 赋完值之后，DOM的加载需要时间,延迟一点时间处理图片
        setTimeout(() => {
          this.addImage()
        }, 10)
        this.isLoading = false
      } catch (error) {
        this.isLoading = false
        if (error.response && error.response.status === 404) {
          this.errorStatus = 404
          console.log(this.errorStatus)
        }    
      }
    },
    updatRows(row) {
      this.commentList.unshift(row)
      // 关闭弹出层
      this.show = false
    },
    addImage() {
      // 获取文章内容的htmlDOM对象
      const cont = this.$refs.content
      const list = cont.querySelectorAll('img')
      // 循环给图片添加单击事件
      list.forEach((item, index) => {
        // 把图片添加的预览组件的集合中
        this.imgList.push(item.src)
        // 添加事件
        item.onclick = () => {
          ImagePreview({
            images:this.imgList,
            startPosition:index
          })
        }
      })
      // 添加图片预览功能
      // ImagePreview(['https://img01.yzcdn.cn/vant/apple-1.jpg'])
    }
  },
  // 生命周期 - 创建完成（可以访问当前this实例）
  created() {
    // 获取文章的id，进行查询
    this.getDetail()
  },
  // 生命周期 - 挂载完成（可以访问DOM元素）
  mounted() {
    
  }
}
</script>

<style lang="less">
@import url('./github-markdown.css');
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>